A current if flowing east along a power line. If the earth's field is neglecteda the direction of the magnetic field below it is
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Who developed the electromagnetic theory of light in 1862?
One weber of flux is equal to _______ magnetic lines of force.
Which of the following is used by temporary magnets as the magnetic material?
A negative ion results when an atom gains an additional
Magnetic effects of the earth as a huge magnet with north and south poles.
Core materials of a good relay have _________ hysteresis loop.
If the length and area of cross-section of a wire are doubleda then its resistance
Hysteresis is a phenomenon of _________ in a magnetic circuit.
One coulomb of charge consists of ________ electrons.
What is used as the insulating material or dielectric in an electric ion
Which element has four valence electrons?
What is the SI unit of magnetic flux?
Bonding of atoms that is due to the force of attraction between positive ions and a group of negative…
The hot resistance of an incandescent lamp is about _______ its cold resistance.
The dielectric constant of most materials lies between
An alloy of 22 percent iron and 78 per cent nickel.
This paper does not exhibit electricity because it contains the same number of
The permeability of permalloy is
What is the main advantage of temporary magnets?
A magnetizing force of 1000 AT/m will produce a flux density of __________ i
A test charge means a charge of
The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole…
At/m is a unit of
In electro-mechanical conversion devices like generators and motors the reason why a small air gap is…
The uncharged particles which have no effect on its atomic charge.
An effect which is generally used in the gausameter to measure flux density.
The mass of proton is __________ the mass of an electron.
A current if flowing east along a power line. If the earth's field is neglecteda the direction of the…
Mmf in a magnetic circuit corresponds to _____ in an electric circuit
Ohm's law can be used only to a _____ circuit or component.
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